Number of uhd and uHd in all weighted lattice paths B(n).

Terms

a(0) =0a(1) =0a(2) =0a(3) =0a(4) =1a(5) =3a(6) =7a(7) =18a(8) =45a(9) =112a(10) =281a(11) =706a(12) =1778a(13) =4490a(14) =11363a(15) =28814a(16) =73199a(17) =186257a(18) =474635a(19) =1211122a(20) =3094171a(21) =7913765a(22) =20261142a(23) =51921920a(24) =133171656a(25) =341836748a(26) =878104607a(27) =2257208148a(28) =5805964495a(29) =14942942127